42550020521 has 4 divisors (see below), whose sum is σ = 42657199812. Its totient is φ = 42442841232.

The previous prime is 42550020479. The next prime is 42550020529. The reversal of 42550020521 is 12502005524.

42550020521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36609464896 + 5940555625 = 191336^2 + 77075^2 .

It is a cyclic number.

It is not a de Polignac number, because 42550020521 - 2¹⁰ = 42550019497 is a prime.

It is a super-2 number, since 2×42550020521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42550020529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53589050 + ... + 53589843.

It is an arithmetic number, because the mean of its divisors is an integer number (10664299953).

Almost surely, 2^42550020521 is an apocalyptic number.

It is an amenable number.

42550020521 is a deficient number, since it is larger than the sum of its proper divisors (107179291).

42550020521 is a wasteful number, since it uses less digits than its factorization.

42550020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107179290.

The product of its (nonzero) digits is 4000, while the sum is 26.

The spelling of 42550020521 in words is "forty-two billion, five hundred fifty million, twenty thousand, five hundred twenty-one".